[tz] Add new timezone for Hanoi Capital, Vietnam

[Tim Parenti]

As was discussed on the original thread in October 2014, pre-unification
time in Hanoi matches Asia/Bangkok since 1970 and thus is already
considered covered by the database.  See
https://mm.icann.org/pipermail/tz/2014-October/021669.html, and refer to
the inclusion of "VN" in the following line of zone1970.tab:

TH,KH,LA,VN     +1345+10031     Asia/Bangkok    Indochina (most areas)

Though perhaps this warrants a brief comment in the "Vietnam" section of
the asia file.

--
Tim Parenti


On Sun, 17 Feb 2019 at 20:43, Phake Nick <c933103 at gmail.com> wrote:

> It is actually reasonable to have both Asia/Hanoi and Asia/Ho_Chi_Minh in
> tz database because the two cities (and the two fractions that control
> them) used different timezone from year 1968 to 1975, which mean even time
> after the UNIX Epoch would be affected.
>
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